RRS Charles Darwin Cruise CD157, 28 May - 13 June 2004. Sediment transport through the Setubal and Nazare Canyons

Weaver, P.P.E.. 2004 RRS Charles Darwin Cruise CD157, 28 May - 13 June 2004. Sediment transport through the Setubal and Nazare Canyons. Southampton, UK, Southampton Oceanography Centre, 27pp. (Southampton Oceanography Centre Cruise Report 49)

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Abstract/Summary

The main objective of the cruise was to groundtruth the sidescan sonar coverage of the Setubal and Nazare Canyons that was collected on the RV Pelagia in November 2003. A range of corers including box, mega, kastenlot and piston provided a range of possibilities to core sediment of varying grainsize from gravel to mud. In addition a deeptowed profiler was used to collect subsurface profiles across the canyons, but plans to use SHRIMP were abandoned due to problems with the conducting cable. The coring was a success given the difficult topography; site location was aided by the TOBI sidescan survey completed in 2003, making it possible to hit relatively small targets just a few hundred metres across. Careful choice of corer type ensured core recovery in the sequence of mixed sands and muds. No corers worked well in the Nazare thalweg due to presumed hard or sandy seabed. The data will be used to groundtruth the TOBI sidescan and to determine the flux of sediment through the Setubal and Nazare Canyons. Initial interpretations suggest significant differences between the canyons and strong changes in the amount of activity with time.

Item Type:	Publication - Report
Additional Keywords:	Charles Darwin, cruise CD157 2004, EUROSTRATAFORM, Iberia, Nazare Canyon, Portugal, sediment cores, Setubal Canyon, submarine canyons
Date made live:	14 Jan 2005 +0 (UTC)
URI:	https://nora.nerc.ac.uk/id/eprint/114006

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